[ovirt-users] How to migrate un-migratable VMs?

[Tomas Jelinek]

----- Original Message -----
> From: "Nicolas Ecarnot" <nicolas at ecarnot.net>
> To: users at ovirt.org
> Sent: Monday, May 16, 2016 12:32:31 PM
> Subject: [ovirt-users] How to migrate un-migratable VMs?
> 
> Hi,
> 
> Some VMs are doing high guest-memory writes (mainly files and mail
> servers, but not only), so migrations are reproductively failing.
> I found some info here :
> https://bugzilla.redhat.com/show_bug.cgi?id=919201
> that confirm what I was fearing.
> 
> This BZ is aging from dinosaurs times, so I was wondering now we're in
> the 3.6.x age and 4.x coming, are there advices one may give to migrate
> those verbose VMs?

hi,

in 4.0 we have been working hard to enhance the migrations:
https://bugzilla.redhat.com/1252426

in 4.0 it should:
- make use of the bandwidth much better
- have some policies which will be managing the downtime and you will be able to pick per cluster and override per VM
- have ability to write custom hooks inside the guest which will be notified that now the VM is migrating (if you have some custom logic you want to do)

...and some more enhancements

Long story short, in 4.0 it your VMs should migrate much more smooth

> 
> I guess increasing the allowed page memory is not a correct answer as it
> will fill as before.
> 
> Any thoughts?
> 
> --
> Nicolas ECARNOT
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